Children of the Mind by Orson Scott Card

He turns to a friend on the world Pacifica for advice, prompting Peter and Wang-mu to visit there in order to attempt to sway Hikari's friend. Hikari was responsible for swinging the Starways Congress vote to send the Lusitania fleet.

It's a world founded by Japanese colonists, in order to meet Aimaina Hikari, the Japanese philosopher who is the intellectual and spiritual head of the Necessarian school. Peter and Si Wang-mu begin their journey on the planet of Divine Wind.

At Miro's urging, the Hive Queen begins working with her sisters and the pequenino fathertrees to discover a way to save Jane by helping her move into Young Val's body. Not only is Young Val disintegrating, but also Ender himself collapses, near death, with the effort of keeping three bodies alive. Yet maintaining three separate bodies is a strain on Ender. He even offers Young Val's body to Jane, telling Miro that she is welcome to it if she can find a way to inhabit it before she is shut down. Miro entreats his assistance, but Ender refuses, feeling absolved from responsibility as he has created Peter and Val, two alternate versions of himself, to continue his work. With catastrophe around the corner, Jane and her allies could sorely use Ender's help but Ender, fatigued by over 3000 years of actively steering the fate of the human race, retreats into the monastic order 'The Children of the Mind' in order to reconcile with his estranged wife, Novinha.

Jane, the incredible being who dwells in the computer and long distance communication networks, rapidly moves colonists off the planet using her newly acquired ability to affect instant interstellar travel before her own imminent destruction because of Starways Congress ordering her shut down. Meanwhile, Ender's stepson Miro and Young Valentine, Ender's other child of the mind, continue scouting for new habitable planets.

In fact, the novel begins even at the moment when Si-Wang-mu, the young servant girl from Path, joins Ender's brainchild Peter to join him in his mission to stop the Lusitania Fleet from destroying Lusitania. Children of the Mind is the fourth and final novel in the Ender quartet, continuing precisely where Xenocide leaves off.

Children of the Mind by Orson Scott Card